This see-through framing is typically a design choice, or sometimes indicative of budgetary constraints.
These results could be indicative of structural constraints in female expression of mate preference or in their perception abilities.
Consistently high levels of conservation within Angiospermae are indicative of evolutionary constraints on the cp genome of photosynthetic plants [ 21].
Whether their rise may result from convergent evolution, involving different mechanisms, or parallel evolution, relying on the deployment of the same mechanisms and possibly indicative of developmental constraints, remains an open question.
However, similar to the combined analysis of all ecoregions, at peak productivity the lower limit of species richness was indistinguishable from that found in low productivity ecoregions, indicative of unmeasured constraints that are not related to NPP.
We are only asking how common are sequences favouring certain structural transitions in each genome and whether their frequency could be indicative of selective constraints acting on such sequences.
The fundamental observation of [27], [28] was that longer stretches of conserved sequence are no more indicative of evolutionary constraint than are short sequences.
In each quartet, there are many introns that contain highly significant local sequence similarities within each pair, indicative of selective constraint.
Hence, it is dN, rather than dS, that appears responsible for the increased ω estimate on the Eutherian UCP1 lineage, again indicative of relaxed constraint.
To eliminate this problem, we identified 10 middle-aged TE insertions that demonstrated a bias toward substitutions in the third position indicative of selective constraint on an active lineage.
